(Sunday, 7/29/2018) 3:00 PM - 6:00 PM
Room: Exhibit Hall
Purpose: To describe the design and the construction of accelerator-based boron neutron capture therapy (AB-BNCT) facility with multiple treatment rooms at Southern Tohoku BNCT Research Center (STBRC).
Methods: AB-BNCT system at STBRC is equipped with a cyclotron-based epithermal neutron source (C-BENS), which consists of a cyclotron accelerator (HM-30), a beryllium neutron production target, and a beam shaping assembly (BSA). The specifications of the C-BENS at STBRC are same as those at Kyoto University Research Reactor Institute (KURRI) except that STBRC has two beamlines. At first, we considered selecting radiation protection materials around BSA to reduce whole-body exposure of the patients compared to that at KURRI. Next, we developed a patient remote transport system (PRTS) for workers to reduce the work time in the treatment room under the condition of remaining activities just after an irradiation. We studied the feasibility of this system and carefully designed optimum layout to realize patient flow and workflow efficiently.
Results: To reduce the activities caused by thermal neutron, BSA is surrounded by LiF-loaded polyethylene blocks and low-activation concrete. The measured out-of-field thermal and fast neutron dose profiles were in good agreement with calculated ones using MCNPX. It was also confirmed that PRTS could be operated up to 9 m apart from PRTS without any problems. We designed the upside-down Y shaped beamline configuration, in which HM-30 and two treatment rooms are assumed to be located on a top and bottoms, respectively. 110 degree of beam deflection angle was thought to be the most desirable from the view point of workflow.
Conclusion: We successfully established the environment of BNCT as one of the division of general hospital without sense of incongruity in comparison of environment of conventional radiotherapy. The AB-BNCT system described here can be tolerated enough for practical use for BNCT in a hospital.
Keywords
Epithermal Neutrons, Cyclotrons, Neutron Capture Therapy
Taxonomy
TH- External Beam- Particle therapy: Neutron therapy- BNCT
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